/*
 * Copyright (c) 2007-2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.sun.org.apache.bcel.internal.generic;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
import com.sun.org.apache.bcel.internal.Constants;
import com.sun.org.apache.bcel.internal.Repository;
import com.sun.org.apache.bcel.internal.classfile.JavaClass;

/**
 * Denotes reference such as java.lang.String.
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 */
public final class ObjectType extends ReferenceType {
    private String class_name; // Class name of type

    /**
     * @param class_name fully qualified class name, e.g. java.lang.String
     */
    public ObjectType(String class_name) {
        super(Constants.T_REFERENCE, "L" + class_name.replace('.', '/') + ";");
        this.class_name = class_name.replace('/', '.');
    }

    /** @return name of referenced class
     */
    public String getClassName() {
        return class_name;
    }

    /** @return a hash code value for the object.
     */
    public int hashCode() {
        return class_name.hashCode();
    }

    /** @return true if both type objects refer to the same class.
     */
    public boolean equals(Object type) {
        return (type instanceof ObjectType) ? ((ObjectType) type).class_name.equals(class_name) : false;
    }

    /**
     * If "this" doesn't reference a class, it references an interface
     * or a non-existant entity.
     */
    public boolean referencesClass() {
        JavaClass jc = Repository.lookupClass(class_name);
        if (jc == null)
            return false;
        else
            return jc.isClass();
    }

    /**
     * If "this" doesn't reference an interface, it references a class
     * or a non-existant entity.
     */
    public boolean referencesInterface() {
        JavaClass jc = Repository.lookupClass(class_name);
        if (jc == null)
            return false;
        else
            return !jc.isClass();
    }

    public boolean subclassOf(ObjectType superclass) {
        if (this.referencesInterface() || superclass.referencesInterface())
            return false;

        return Repository.instanceOf(this.class_name, superclass.class_name);
    }

    /**
     * Java Virtual Machine Specification edition 2, 5.4.4 Access Control
     */
    public boolean accessibleTo(ObjectType accessor) {
        JavaClass jc = Repository.lookupClass(class_name);

        if (jc.isPublic()) {
            return true;
        } else {
            JavaClass acc = Repository.lookupClass(accessor.class_name);
            return acc.getPackageName().equals(jc.getPackageName());
        }
    }
}
